Biology and Medicine 



465 



footed were 

 and the Ital 

 the liookwor 

 the Geniian 

 infected soil 

 of biological 

 years an in 

 of "gronnd 



anemic, run down and unable to do good work, 

 ian Perroncito at that time traced the disease to 

 ■m Ankylostomum duodenale. Some years later 

 Looss, traced the eouise of the worm from the 

 to the intestine of its victim by a very clever bit 

 detective work. There had been known for many 

 itation of the skin of the feet under the names 

 itch," "foot itch," "dew itch," etc. 



(a) Female, (b) Male, and (c) Mouth of the Hookworm 



An animal which is mainly responsible for the condition of the "poor 

 whites" in the Soutii, and wliii-h causes an economic loss of perhaps 

 $500,000,000 annually. The disease can be effectively and easily cured, 

 while its prevention is merely a jnatter of a few simple sanitary pre- 

 cautions. (After Stiles.) 



"AVhile experimenting with hookworm larvie he spilled 

 some of them on his liand ; he noticed a burning sensation 

 and in a few minutes the larvae had disappeared. After the 

 proper interval, about two months, he found himself sutfcr- 

 ing with the hookworm disease. To determine what had be- 

 come of the larvffi that were spilled on his hand he poure<l 

 some larvffi on the leg that was about to be amputated from 

 a boy; on sectioning the skin of this leg, after amputation, 

 he found the larva3 had worked their way through the skin 



